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The package name should reflect the module s file name remember that the module MyGroup::MyModule equates to a file name of MyGroup/MyModulepm The remaining statements import the Exporter module, and the @ISA array defines the inheritance it s inheritance that allows the import module in Exporter to be inherited by the module you are creating The Exporter module then uses the values in @EXPORT, @EXPORT_OK, @EXPORT_FAIL, and %EXPORT_TAGS to determine which objects should or should not be exported from the module The @EXPORT array should be used to list the objects that should be exported by default from the module The @EXPORT_OK array should list the objects that can be exported if they have been specifically requested For example, this:

.

use MyModule qw/process regurgitate/;

%EXPORT_TAGS = ('standard' => [process, regurgitate], 'processing' => [process, parse]);

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An Oracle server consists of an instance and a database; the two are separate, but connected The instance comprises memory structures and processes, stored in your machine s RAM and executing on its CPU(s); its existence is transient; it can be started and stopped The database comprises files on disk; once created, it persists until it is deleted Creating an instance is nothing more than building the memory structures and starting the processes Creating a database is done by the instance as a once-off operation, and the instance can then open and close it many times subsequently The database is inaccessible without the instance Within the database there is a set of tables and other segments called the data dictionary The data dictionary describes all the logical and physical structures in the database, including all the segments that store user data The process of database creation establishes the bare minimum of physical structures needed to store the data dictionary, and then creates the data dictionary within them An instance is defined by an instance parameter file The parameter file contains directives that define how the instance should be initialized in memory: the size of the memory structures, and the behavior of the background processes After building the instance, it is said to be in no mount mode In no mount mode, the instance exists but has not connected to a database Indeed, the database may not even exist at this point All parameters, either specified by the parameter file or implied, have default values, except for one: the parameter DB_NAME The DB_NAME parameter names the database to which the instance will connect This name is also embedded in the controlfile The CONTROL_FILES parameter points the instance to the location of the controlfile This parameter defines the connection between the instance and the database When the instance reads the controlfile (which it will find by reading the CONTROL_FILES parameter) if there is a mismatch in database names, the database will not mount In mount mode, the instance has successfully connected to the controlfile If the controlfile is damaged or nonexistent, it will be impossible to mount the database The controlfile is small, but vital Within the controlfile, there are pointers to the other files (the online redo logfiles and the datafiles) that make up the rest of the database Having mounted the database, the instance can open the database by locating and opening these other files An open database is a database where the instance has opened all the available online redo logfiles and datafiles Also within the controlfile, there is a mapping of datafiles to tablespaces This lets the instance identify the datafile(s) that make(s) up the SYSTEM tablespace within which it will find the data dictionary The data dictionary lets the instance resolve references to objects referred to in SQL code to the segments in which they reside, and work out where, physically, the objects are The creation of a database server must therefore involve these steps: Create the instance Create the database Create the data dictionary.

use MyModule qw/:standard :processing/;

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